Lab 20 Muscles of the shoulders, arm, and hand

Quiz for next week • Tuesday or

Thursday?

• Same format as today • Know Upper Arm, Lower Arm

,

Hip and Thigh, Upper Leg and Lower Leg

Muscles to know • • •

supraspinatus infraspinatus subscapularis

• •

teres major rhomboid

• •

levator scapulae deltoid

• biceps brachii • brachialis • triceps brachii • flexor carpi radialis • flexor carpi ulnaris • flexor digitorum sup.

• extensor carpi ulnaris • extensor digitorum • extensor carpi radialis • brachioradialis

Cut activity 4 • Only hand muscles you need to know are not explicitly mentioned in the lab (but they do appear in the pictures): – flexor pollicus longus – extensor pollicis longus

Muscles that Move the Arm Figure 11–15a

Muscles that Move the Arm Figure 11–15b

Muscles that Move the Arm (1 of 3) • Deltoid : – the major abductor • Supraspinatus : – assists deltoid • Subscapularis and teres major : – produce medial rotation at shoulder

Muscles that Move the Arm (2 of 3) • Infraspinatus : – produce lateral rotation at shoulder

Muscles that Move the Arm (3 of 3) • Pectoralis major : – between anterior chest and greater tubercle of humerus – produces flexion at shoulder joint • Latissimus dorsi : – between thoracic vertebrae and humerus – produces extension at shoulder joint

The Rotator Cuff • Muscles involved in shoulder rotation – supraspinatus, subscapularis, infraspinatus, teres minor ,and their tendons

Summary: Muscles that Move the Arm Table 11–12

Muscles that Position the Pectoral Girdle • Rhomboid and levator scapulae : – deep to trapezius – attach to cervical and thoracic vertebrae – insert on scapular border

Muscles that Move the Forearm and Hand • Originate on humerus and insert on forearm • Exceptions: – the major flexor ( biceps brachii ) – the major extensor ( triceps brachii )

Extensors and Flexors • Extensors: – mainly on posterior and lateral surfaces of arm • Flexors: – mainly on anterior and medial surfaces

Muscles that Move the Forearm and Hand • Biceps brachii : – flexes elbow – stabilizes shoulder joint –

originates

on scapula and humerus –

inserts

on radial tuberosity

Muscles that Move the Forearm and Hand • Triceps brachii : – extends elbow –

originates

on scapula (three spots) –

inserts

on olecranon • Brachialis and brachioradialis : – assist in flexing elbow (synergists)

Muscles that Move the Forearm and Hand -Extensors Figure 11–16a

Muscles that Move the Forearm and Hand - Flexors Figure 11–16b

Muscles that Move the Forearm and Hand • Flexor carpi ulnaris : – superficial – flexes wrist –

ad

ducts wrist

Muscles that Move the Forearm and Hand • Flexor carpi radialis : – superficial – flexes wrist –

ab

ducts wrist

Muscles that Move the Forearm and Hand • Extensor carpi radialis : – superficial – extends wrist –

ab

ducts wrist

Muscles that Move the Forearm and Hand • Extensor carpi ulnaris : – superficial – extends wrist –

ad

ducts wrist

Figure 11–16a

Figure 11–16b

Summary: Muscles that Move the Forearm and Hand Table 11–13 (1 of 2)

Today • Work through lab 20 • Relevant parts of lab reports due Next Week